| Business | Phone |
| Unity Consulting Group 82 Whitethorn Dr, Guilford 6437 | (203) 453-8690 |
| Guilford Consulting 94 Quonnipaug Ln, Guilford 6437 | (203) 457-1541 |
| Healy Consulting Co 200 Valley Shore Dr, Guilford 6437 | (203) 453-1644 |
| Idea 1795 Boston Post Rd # 5a, Guilford 6437 | (203) 458-0482 |
| Innovative Computer Technology 222 Sage Hollow Rd, Guilford 6437 | (203) 457-1127 |